SU1021515A1 - Die - Google Patents

Description

The invention relates to the machining of metals by pressure, in particular, to bulbs for die forging.

A stamp for closed stamping of forgings is known, consisting of a npHiuwHoro punch, an ejector punch with wedge bearing surfaces, supported on a wedge slider, which interact with wedge matrix inserts pressed against the punch by moving along the wedge surfaces. The disadvantages of such a stamp are its complexity and the great complexity of manufacturing because of the need for an exact fit, a large number of matched parts of the parts of the stamp along the inclined surfaces.

Also known is a stamp containing a die, an ejector and a punch with interchangeable profile linings fixed on it 2.

The disadvantage of this stamp is that on the resulting forgings, face fins / accelerates the wear of the stamp pads and require additional costs for their removal.

The purpose of the invention is to improve the quality of forgings and the durability of sht1mpa. This goal is achieved by tem | that in the stamp containing the matrix, the ejector and the punch with the profile pads attached to it, each of the latter is installed with the possibility of mixing in the direction of the wall of the cavity of the matrix and: it has a skewed support surface f, and the punch is also filled with reciprocal beveled; moreover, the bevel angle of these surfaces with respect to the pressure, perpendicular to the axis of the punch, exceeds the angle of self-simulation. neither

FIG. 1 shows a stamp at the time of completion of the stamping, broken in FIG. 2 — node 1 in FIG. 1, in FIG. 3 - the same, option.

The stamp consists of a matrix 2 and an ejector 3 mounted on the upper movable plate of the pensrna 1 and mounted on the lower fixed plate of the ejector plate 3. Along the perimeter of the working edge of the punch face, there are made recesses in which interchangeable pads 4 are installed. The lining profile consists of a wedge element a, flat spring element b and element c attached to the side surface

punch, for example, with screws (Fig. 2). The wedge element a of the lining 4 and the punch 1 interact over the surface A, inclined at an angle oL to the normal to the wall i of the matrix. Vronoi, more angle of braking.

The stamp works as follows.

0 After laying the workpiece in the cavity of the matrix and turning on the prosse, the punch enters the matrix and deforms the workpiece 5. During the deformation process, the metal of the workpiece fills the corners

5 of the cavity of the matrix, comes into contact with the bottom surface of the wedge element a of the lining 4. Since the angle about is more than the self-braking angle, under the influence of the pressure of the deformable metal, the wedge element a of the lining smears along the beveled surface A of the punch 1 to the wall of the matrix 2 and presses to it, closing the gap between the wall of the cavity of the matrix and the punch. In this case, the patch element b is elastically bent, thus eliminating the possibility of forming a burr.

After the end of the deformation during the return stroke of the press at the time of the separation of the punch 1 from the forging 5, the contact of the pads 4 with the forging metal breaks. The wedge elements a of the linings are retracted from the walls of the cavity of the matrix 2 due to the restoration of the shape of the spring element b and the punch 1 together with the linings are freely removed from the matrix, the forging is pushed out of the matrix of ejection 3. Next, the stripping cycle is repeated.

In terms of detail on the round punch, an angitogic attachment is set.

5 profile in the form of a split ring.

. For stamping non-round parts

mold on the punch is installed

several overlays, the number of which

corresponds to the number of linear ones

Q or curved faces forgings. On inclined planes of the socket of the punch, the face of the punch lining is installed with a corresponding inclination.

In comparison with the evect, the proposed technical solution for POSZOs: it significantly improves the quality of forgings and increases the durability of the stamp by eliminating the formation of face burrs on the forgings.

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Claims (1)

- A STAMP containing a die, ejector and punch with replaceable profile plates fixed on it, with the exception that in order to improve the quality of forgings and increase the durability of the stamp, each plate is installed with the possibility of displacement in the direction of the wall of the cavity of the matrix and has a beveled supporting surface, while the punch is also made with a reciprocal beveled surface, and the angle of inclination of these surfaces with respect to the direction perpendicular to the axis of the punch exceeds the angle of self-braking.